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7 |
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8 | 'use strict';
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9 |
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10 | Object.defineProperty(exports, '__esModule', {
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11 | value: true
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12 | });
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13 |
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14 | var _slicedToArray = (function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i['return']) _i['return'](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError('Invalid attempt to destructure non-iterable instance'); } }; })();
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15 |
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16 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
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17 |
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18 | var _videoJs = require('video.js');
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19 |
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20 | var _videoJs2 = _interopRequireDefault(_videoJs);
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21 |
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22 |
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23 | var TIME_FUDGE_FACTOR = 1 / 30;
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24 |
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25 |
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26 |
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27 |
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28 |
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29 | var SAFE_TIME_DELTA = TIME_FUDGE_FACTOR * 3;
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30 |
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31 |
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32 |
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33 |
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34 |
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35 |
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36 |
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37 |
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38 | var clamp = function clamp(num, _ref) {
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39 | var _ref2 = _slicedToArray(_ref, 2);
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40 |
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41 | var start = _ref2[0];
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42 | var end = _ref2[1];
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43 |
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44 | return Math.min(Math.max(start, num), end);
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45 | };
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46 | var filterRanges = function filterRanges(timeRanges, predicate) {
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47 | var results = [];
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48 | var i = undefined;
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49 |
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50 | if (timeRanges && timeRanges.length) {
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51 |
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52 | for (i = 0; i < timeRanges.length; i++) {
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53 | if (predicate(timeRanges.start(i), timeRanges.end(i))) {
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54 | results.push([timeRanges.start(i), timeRanges.end(i)]);
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55 | }
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56 | }
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57 | }
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58 |
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59 | return _videoJs2['default'].createTimeRanges(results);
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60 | };
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61 |
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62 |
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63 |
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64 |
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65 |
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66 |
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67 |
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68 |
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69 | var findRange = function findRange(buffered, time) {
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70 | return filterRanges(buffered, function (start, end) {
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71 | return start - TIME_FUDGE_FACTOR <= time && end + TIME_FUDGE_FACTOR >= time;
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72 | });
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73 | };
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74 |
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75 |
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76 |
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77 |
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78 |
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79 |
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80 |
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81 | var findNextRange = function findNextRange(timeRanges, time) {
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82 | return filterRanges(timeRanges, function (start) {
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83 | return start - TIME_FUDGE_FACTOR >= time;
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84 | });
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85 | };
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86 |
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87 |
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88 |
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89 |
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90 |
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91 |
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92 | var findGaps = function findGaps(buffered) {
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93 | if (buffered.length < 2) {
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94 | return _videoJs2['default'].createTimeRanges();
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95 | }
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96 |
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97 | var ranges = [];
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98 |
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99 | for (var i = 1; i < buffered.length; i++) {
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100 | var start = buffered.end(i - 1);
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101 | var end = buffered.start(i);
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102 |
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103 | ranges.push([start, end]);
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104 | }
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105 |
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106 | return _videoJs2['default'].createTimeRanges(ranges);
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107 | };
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108 |
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109 |
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110 |
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111 |
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112 |
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113 |
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114 |
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115 |
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116 |
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117 |
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118 | var findSoleUncommonTimeRangesEnd = function findSoleUncommonTimeRangesEnd(original, update) {
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119 | var i = undefined;
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120 | var start = undefined;
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121 | var end = undefined;
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122 | var result = [];
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123 | var edges = [];
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124 |
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125 |
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126 |
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127 |
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128 |
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129 |
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130 | var overlapsCurrentEnd = function overlapsCurrentEnd(span) {
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131 | return span[0] <= end && span[1] >= end;
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132 | };
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133 |
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134 | if (original) {
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135 |
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136 | for (i = 0; i < original.length; i++) {
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137 | start = original.start(i);
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138 | end = original.end(i);
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139 |
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140 | edges.push([start, end]);
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141 | }
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142 | }
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143 |
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144 | if (update) {
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145 |
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146 |
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147 | for (i = 0; i < update.length; i++) {
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148 | start = update.start(i);
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149 | end = update.end(i);
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150 |
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151 | if (edges.some(overlapsCurrentEnd)) {
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152 | continue;
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153 | }
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154 |
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155 |
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156 | result.push(end);
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157 | }
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158 | }
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159 |
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160 |
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161 |
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162 | if (result.length !== 1) {
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163 | return null;
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164 | }
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165 |
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166 | return result[0];
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167 | };
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168 |
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169 |
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170 |
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171 |
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172 |
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173 |
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174 |
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175 | var bufferIntersection = function bufferIntersection(bufferA, bufferB) {
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176 | var start = null;
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177 | var end = null;
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178 | var arity = 0;
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179 | var extents = [];
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180 | var ranges = [];
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181 |
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182 | if (!bufferA || !bufferA.length || !bufferB || !bufferB.length) {
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183 | return _videoJs2['default'].createTimeRange();
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184 | }
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185 |
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186 |
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187 |
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188 | var count = bufferA.length;
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189 |
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190 |
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191 | while (count--) {
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192 | extents.push({ time: bufferA.start(count), type: 'start' });
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193 | extents.push({ time: bufferA.end(count), type: 'end' });
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194 | }
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195 | count = bufferB.length;
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196 | while (count--) {
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197 | extents.push({ time: bufferB.start(count), type: 'start' });
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198 | extents.push({ time: bufferB.end(count), type: 'end' });
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199 | }
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200 |
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201 | extents.sort(function (a, b) {
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202 | return a.time - b.time;
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203 | });
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204 |
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205 |
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206 |
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207 | for (count = 0; count < extents.length; count++) {
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208 | if (extents[count].type === 'start') {
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209 | arity++;
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210 |
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211 |
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212 |
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213 | if (arity === 2) {
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214 | start = extents[count].time;
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215 | }
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216 | } else if (extents[count].type === 'end') {
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217 | arity--;
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218 |
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219 |
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220 |
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221 | if (arity === 1) {
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222 | end = extents[count].time;
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223 | }
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224 | }
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225 |
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226 |
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227 | if (start !== null && end !== null) {
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228 | ranges.push([start, end]);
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229 | start = null;
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230 | end = null;
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231 | }
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232 | }
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233 |
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234 | return _videoJs2['default'].createTimeRanges(ranges);
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235 | };
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236 |
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237 |
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238 |
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239 |
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240 |
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241 |
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242 |
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243 |
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244 |
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245 |
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246 |
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247 |
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248 |
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249 | var calculateBufferedPercent = function calculateBufferedPercent(adjustedRange, referenceRange, currentTime, buffered) {
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250 | var referenceDuration = referenceRange.end(0) - referenceRange.start(0);
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251 | var adjustedDuration = adjustedRange.end(0) - adjustedRange.start(0);
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252 | var bufferMissingFromAdjusted = referenceDuration - adjustedDuration;
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253 | var adjustedIntersection = bufferIntersection(adjustedRange, buffered);
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254 | var referenceIntersection = bufferIntersection(referenceRange, buffered);
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255 | var adjustedOverlap = 0;
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256 | var referenceOverlap = 0;
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257 |
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258 | var count = adjustedIntersection.length;
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259 |
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260 | while (count--) {
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261 | adjustedOverlap += adjustedIntersection.end(count) - adjustedIntersection.start(count);
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262 |
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263 |
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264 |
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265 |
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266 |
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267 | if (adjustedIntersection.start(count) === currentTime) {
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268 | adjustedOverlap += bufferMissingFromAdjusted;
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269 | }
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270 | }
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271 |
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272 | count = referenceIntersection.length;
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273 |
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274 | while (count--) {
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275 | referenceOverlap += referenceIntersection.end(count) - referenceIntersection.start(count);
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276 | }
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277 |
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278 |
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279 |
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280 | return Math.max(adjustedOverlap, referenceOverlap) / referenceDuration * 100;
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281 | };
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282 |
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283 |
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284 |
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285 |
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286 |
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287 |
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288 |
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289 |
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290 |
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291 |
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292 |
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293 |
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294 |
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295 | var getSegmentBufferedPercent = function getSegmentBufferedPercent(startOfSegment, segmentDuration, currentTime, buffered) {
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296 | var endOfSegment = startOfSegment + segmentDuration;
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297 |
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298 |
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299 | var originalSegmentRange = _videoJs2['default'].createTimeRanges([[startOfSegment, endOfSegment]]);
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300 |
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301 |
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302 |
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303 |
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304 |
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305 |
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306 |
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307 | var adjustedSegmentRange = _videoJs2['default'].createTimeRanges([[clamp(startOfSegment, [currentTime, endOfSegment]), endOfSegment]]);
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308 |
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309 |
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310 |
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311 | if (adjustedSegmentRange.start(0) === adjustedSegmentRange.end(0)) {
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312 | return 0;
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313 | }
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314 |
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315 | var percent = calculateBufferedPercent(adjustedSegmentRange, originalSegmentRange, currentTime, buffered);
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316 |
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317 |
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318 |
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319 | if (isNaN(percent) || percent === Infinity || percent === -Infinity) {
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320 | return 0;
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321 | }
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322 |
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323 | return percent;
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324 | };
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325 |
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326 |
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327 |
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328 |
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329 |
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330 |
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331 |
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332 | var printableRange = function printableRange(range) {
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333 | var strArr = [];
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334 |
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335 | if (!range || !range.length) {
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336 | return '';
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337 | }
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338 |
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339 | for (var i = 0; i < range.length; i++) {
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340 | strArr.push(range.start(i) + ' => ' + range.end(i));
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341 | }
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342 |
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343 | return strArr.join(', ');
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344 | };
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345 |
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346 |
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347 |
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348 |
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349 |
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350 |
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351 |
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352 |
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353 |
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354 |
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355 |
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356 |
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357 |
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358 |
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359 |
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360 | var timeUntilRebuffer = function timeUntilRebuffer(buffered, currentTime) {
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361 | var playbackRate = arguments.length <= 2 || arguments[2] === undefined ? 1 : arguments[2];
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362 |
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363 | var bufferedEnd = buffered.length ? buffered.end(buffered.length - 1) : 0;
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364 |
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365 | return (bufferedEnd - currentTime) / playbackRate;
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366 | };
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367 |
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368 | exports['default'] = {
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369 | findRange: findRange,
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370 | findNextRange: findNextRange,
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371 | findGaps: findGaps,
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372 | findSoleUncommonTimeRangesEnd: findSoleUncommonTimeRangesEnd,
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373 | getSegmentBufferedPercent: getSegmentBufferedPercent,
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374 | TIME_FUDGE_FACTOR: TIME_FUDGE_FACTOR,
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375 | SAFE_TIME_DELTA: SAFE_TIME_DELTA,
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376 | printableRange: printableRange,
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377 | timeUntilRebuffer: timeUntilRebuffer
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378 | };
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379 | module.exports = exports['default']; |
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